Expansible reamer.



W. TURNEY. EXPANSIBLE REAMER. APPLICATION FILED SEPT.CO,1910.

Patented July 2, 1912.

7'07/6 7 i dzz-liarrv 1 w?" wr /65565.1 661% (m WILLIAM TURKEY, OF JACKSON, MICHIGAN.

nitransmtn REAMER.

Specification of Letters Patent.

Patented July 2 1912.

Application filed September 30, 1910. Serial No. 684,838.

To all whom it may concern:

Be it known that I, WiLLIAM TUnNnY, of Jackson, in the county of Jackson and State of Michigan, have invented certain new and useful Improvements in Expansible Reamers, of which the following is a specification.

This invention relates to reamers ofthe same general character as that shown in United States Letters Patent No. 959,273, granted me May 24,-1910. The reaming members in that patent and in the present invention are arranged to slide upon convergin seats, whereby the reamer is expandeC or contracted when the reamer mem-' bers are moved in one direction or the other upon their seats.

The object of the present invention is to provide simpler and more eificient means for locking the reaming members in the positions to which they are adjusted.

The locking means of the present invention consists of frusto-conical faces on the ends of the reaming members and nuts threaded upon the shank of the reamer and provided with internal frusto-conical faces adapted to coact with the ends of the reaming members to hold the reaming members a ainst movement longitudinally and radially with relation to the shank. Locking nuts of this character and coacting in this manner are not in themselves'new, the same having been employed in expansible reamers of which the shanks are frusto-conical and of which the adjustable members must be made so that they may expand and contract to fit the tapering shank at various points.

An important feature of the present invcution is the shape of the shank and the arrangement of the coacting faces of the reaming members which engage the shank. The

shank has opposed parallel faces and converging faces or seats. Each of the reaming members has an inclined face adapted to bear upon one of the seats of the shank, and has parallel faces adapted to embrace the parallel faces of the shank. The reaming members are therefore caused to move toward and from each other radially of the shank when they are moved longitudinally of the shank, but their engagement with the shank is uniform, regardless of their adjustment. In other words, the reaming member is not expanded nor contracted when it moves longitudinally or radially of the shank, but, on the other hand, it may move freely both longitudinally and radially when permitted by the locking nuts to move at all. a

()f the accompanying drawings forming a part of this specification: Figure 1 repre sents a side elevation 'of a reamer constructed in accordance with thisinvention. Fig. 2 represents a longitudinal section of the operative portion of the reamer. Fig. 3 represents a cross section on line 33 of Fig. 2. Fig. 4 represents a cross section on line 44 of. Fig. 2. cross section on line 55 of Fig. 2. Fig. 6 represents an elevation of the inner side of one of the reaming members. Fig. 7 represents an end elevation of one of the roaming members. F ig. 8 represents a section on line 8-8 of Fig. 6. Fig. 9 represents a section on line 99 of Fig. 1.

The same reference characters indicate the same parts wherever they occur.

The shank of the reamer is indicated at.

15. The end of the shank which holds the reamin members is formed with opposed paralle faces 16 and with converging faces or seats 17. The end of the shank is screw threaded, as indicated at 18, and the shank is also threaded as indicated at 19. The reaming members are indicated at 20, the said reaming members having cutting edges 21. Each of said reaming members is provided with internal arallel faces 16' and an inclined face 17', t e parallel faces being adapted to embrace the faces 16 of the shank, while the inclined face 17 is ada ted to bear upon an inclined face or seat 1 of the shank. The end faces 22 and 23 of the reaming members are partially frusto-conical. A nut 24 engagin the threaded portion 18 of the shank and aunt 25 engaging the threaded portion 19 are adapted to engage the ends of the reaming members and clamp said members between them. The C0- acting faces of the nuts are frusto-conical, as shown by Fig. 2, although these faces of the nuts are formed internally, Whereas the frusto-conical faces of the reaming members are external.

It is intended that the length of the reaming members shall be equal so that they may be engaged equally and simultaneousl by the nuts 24 and 25, but, inasmuch'as sight variations in the length of the reaming Fig. 5 represents a members and slight irregularities in the fortcrposcd between the reaming members and ers enhance the efiiciency of the reamer by overcomiing the tendency of the reamer to chatter. a

It is ObVlfillS, that the reamer may be ex panded by loosening the nut 25 and by turnmg the nut 24 to cause the reaming members to follow thenut 25. In order to detach the reaming members it is necessary only to loosen one of the huts sufiiciently to free the ends of the reaming members. The rcamin members when released by the nuts are entlrely free to be removed, because they do not at any position engage the shank with tension, this freedom of the reaming members being the result of forming them and the shank with opposed parallel faces.

I claim:

An adjustable reamer comprising a shank having a four-sided portion, two faces ofwhich are flat and parallel to the axis of the shank, and the other two oppositely inclined with reference to the axis, reaming members each having confronting parallel ,faces and an inclined face, the inclined face being seated upon an inclined face of the shank, and nuts threaded on the shank atthe ends of said four-sided portion, saidnuts having internally tapered faces adapted to engage the ends of the reaming members, and the reaming members having eomplementally formed faces for engagement with the nuts.

In testimony whereof I have afiixed my signature, in presence of two witnesses.

WILLIAM TURNEY. Witnesses:

'W. P. ABELL, V

J. H. CHURCHILL. 

